Addressing the challenges of offshore wind turbine installation and maintenance in high winds
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Crane rails: Why they improve offshore lifting capabilities

Crane rails: why they improve offshore lifting capabilities

As demands on offshore wind installation processes increase, crane technology is being pushed to its limits. Not only do offshore cranes need to lift heavier and larger wind turbine components, but they also need to operate in more gruelling weather conditions.

Increasingly, vessel owners and contractors are looking to meet these demands by boosting crane capabilities with technologies such as taglines and various forms of intelligent lifting systems. But there are important implications of these additional demands that impact crane design and performance.

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Intelligent guidance for offshore lifting: The next DP2?

Intelligent guidance systems

A number of years ago, it was normal practice for offshore contractors to win major offshore wind turbine installation projects using non-propelled jack-up barges supported by tugboats and anchors for positioning. This was the established way – it was safe, reliable and efficient.

Then, in around 2011, the introduction of second-generation jack-up vessels brought Dynamic Positioning Systems (DP systems) into play. This became the new ‘state of the art’. In the typical progression of ‘order winners’ becoming ‘qualifiers’, today, vessel owners are not even invited to tender if their installation vessels are not DP2-capable.

If you consider offshore lifting operations of large components such as turbine blades, there is a strong parallel to that of vessel positioning before DP2 became the industry standard. During the lift, manual winches, people with ropes and, in some cases, simple constant-tension systems try to keep the blade under control during the lift. You could compare it to the tugboat-and-anchor method of positioning your jack-up barge. Continue reading →